Centralizing mechanism



y 1945- c. M. FRIDEN ETAL CENTRALIZING MECHANISM Filed July 1, 1940 10 Sheets-Sheet l M m-m Y 054 E ToM N Mm R E 5 o VFV, T mm T 0 A July 31, 1945.

C. M. FRIDEN ETAL CENTRALIZING MECHANISM Filed July 1; 1940 10 Sheets-Sheet 2 INVENTORS C424 M. FE/DEN BY 4N7'H0/VY BJVflC/MDO ATTORN EY y 1945- c. M. FRIDEN ET AL CENTRALIZING MECHANISM Filed July 1, 1940 10 Sheets-Sheet 3 m muwnl mnl 3 QN .g g

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INVENTORS 63424 M. FE/DEN ANTHONY 5.!7/9CH1400 BY MM} QZQMJ ATTORN E Y CENTRALIZ ING MECHANISM Filed July 1, 1940 10 Sheets-Sheet 5 642i M. FE/DfN Y ANTHONY 5 MACH/400 ATTORNEY July 31, 1945.

C. M. FRIDEN ET AL CENTRALIZING MECHANISM Filed July 1, 1940 10 Sheets-Sheet 6 INVENTORS C424 M. FE/DEN HA/THONY 5. lWflEHflDO ATTORNEY July 31, 1945. c. M. FRIDEN ET AL CENTRALIZING MECHANISM Filed July 1, 1940 10 Sheets-Sheet '7 mu mmun-l rnfi. Bk

M 5 M W 0/6 24 N NF R W m N T N MW 67 July 31, 194 c. M. FRIDEN ET AL CENTRALIZING MECHANISM l0 Sheets-SheetB Filed July 1, 1940 ms g l I cnez M. F/Q/DE'N mvraau v a MACH/700 Qt Pt Q N3 g mmuu ATTORN EY July 1945- c. M. FRIDEN ETAL CENTRALIZING MECHANISM Filed July 1, 1940 10 Sheets-Sheet 9 JNJH MH-Lmp NNN Q INVENTORS 5484 M. FB/DEN HNZ'HON YB. MAC/I40 "9&4; "M QeQu;

ATTORNEY July 31, 1945.

C. M. FRIDEN ET AL GENTRALIZING MECHANISM Filed July 1, 1940 10 Sheets-Sheet 10 L-l-l IL L l' INVENTORS M. E/DEN HNTHU/VV 5. MHCHIQDO' BY ATTOQN E'Y Patented July 31, 1945 CENTRALIZING MECHANISM Carl M. Friden, Pleasanton, and Anthony B. Macliado, Oakland, Calii'.. assignors to Friden Calculating Machine 00., Inc., a corporation of California Application July 1, 1940, Serial No. 343,368

9 Claims.

This invention relates to calculating machines, and is concerned more particularly with a provision of improved means-for eii'ecting shifting movement of the shii'table register carriage of calculating machines.

It is a general object of the invention to provide an improved shift mechanism for the shiftable register carriage of calculating machines.

Another object of the invention is to provide a shift mechanism of a smooth and even action, and which is not subject to overthrow.

Another object of the invention is to provide an improved shifting mechanism of the character referred to, wherein the means for centralizing the shift mechanism in any ordinal position is rendered ineffective during plural order shifting operations.

Another object of the invention is to provide an improved shift mechanism of the character referred to wherein the disabling of the shift cen= tralizer is performed automatically.

Other objects and advantages of the invention will be apparent from the following description of certain preferred embodiments thereof, as illustrated in the accompanying drawings, in which:

Figure 1 is a side elevational view partly in section of a calculating machine embodying the invention:

Figtpe 2 is a fragmentary sectional elevation illustrating certain of the shift control connections;

Figure 3 is a side elevational view partly in cross section showing a part of the shift control conneotions.

Figure 4 is a rear eievational view of the machine showing the shii'ting mechanism in coop erative relation with respect to the carriage;

Figure 5 is an enlarged rear elevational view of a portion of Figure 4;

Figure 6 is a view similar to Figure 5 but showing the shift mechanism during operation. As shown, the parts are in half cycle position during a. plural cycle shifting operation;

Figure 7 is a sectional plan view of the shift,

Figure 10 is a cross sectional view taken along the line ll-ifl in Figure 8.

Figure 11 is a view similar to Figure 8 but showing the parts as positioned before a shiftto lug operation starts but with the shift key depressed:

Figure 12 is a view similar to Figure 8 but showing the parts as positioned during a shifting operation.

Referring to Figures 1 to-4, the calculating machine selected for illustration in connection with the invention is of the general type described in the patent to Carl M. Friden, No. 2,229,889, dated January 28, 1941. The machine includes a base i0 upon which side plates II and I! of the frame construction are mounted within the casing 13.

The frame of the machine also includes trans verse brackets i6, i1, IB and US which extends between the side plates i I and i2 and are secured thereto in any convenient manner.

The machine includes a shiftable register carriage 2| which is mounted for endwise sliding movement on frame brackets l6 and it by means of rollers 22. The register carriage 2i serves to mount the numeral wheels 23 or the revolutions counter having an actuator 24 of suitable con-= struction associated therewith. The carriage 2| also mounts numeral wheels 26 of the accumulator which are suitably journaled in carriage frame 21 and adapted for actuation through suitable plus-minus gearing 28 having a sliding driving engagement with a shaft 23. Each shaft 28 receives dill'erential increments oi movement in a known manner from the associated actuating cylinder 3| under control of the usual bank or numeral keys 32 associated therewith. The sign character 0! the registration is controlled by shifting of the plus-minus gearing 28 under the control of a strap 33 which is mounted by suitable upright arms 3% on a transverse rockabie shaft 36 which may be controlled in any convenient manner in performing calculating operations.

The drive for the actuating cylinders 3i and for all other power-driven power operations of the machine is derived from motor ll having its drive shaft 42 connected by gearing 43 with the driving element or ratchet ll of a cyclically operable clutch. Ratchet M is ioumaled on driven shaft 43 which is suitably connected to drive actuating shafts 41 on which the cylinders II are mounted- The yclic operation 0! the clutch is controlled by means of clutch dog ll carried by driven part 43 01' the clutch and spring-urged by means of spring ii to clutch-engaging posiby link 54 with the pivoted lever 53 which is pivotally connected at its lower end with a second pivoted lever 51 which controls the opening and closing of motor circuit contacts 58.

Shift mechanism.--Means are provided for shifting the carriage selectively in either direction for one or more ordinal steps of movement, and the shifting'means is preferably operated from the actuating shafts 41 and the cyclically operable clutch under the control of a pair of manually depressible, freely retractable shift keys which control shifting of the carriage for one or more steps of movement in accordance with the length of time (the number of machine cycles) which they are maintained depressed.

Referring to Figures 1 and 2, the shift control keys are indicated at 10 and H and are mounted for vertical sliding movement on side plates I2 by suitable pin and slot connections. Suitable spring means (not shown) may be provided for maintaining keys 10 and II in their raised positions as shown in Figure 1. As seen in Figure 1. each key 10 and H is provided with a pin 12 which projects to either side of the key. One end of each pin 12 cooperates with a suitable cam surface on a cla-w arm 13 secured to lever 53 for rocking movement therewith. Therefore. upon depression of either shift key 10 and H. levers 55 and 51 are rocked to engage the clutch and close the motor circuit contacts 58.

Prior to the engagement of the clutch and closing of the motor contacts, each of keys 10 and H is operative to engage corresponding shift connections, so that selective shifting movement of the carriage 2| in either direction for one or more ordinal positions is determined by depression and release of the respective keys. As seen in Figure 2, the respective left-hand ends of pin 13 carried by the keys 10 and 1| are operatively related to arms 11 and 18, respectively, which are carried by sleeve 18 and shaft 19 on which sleeve 13 is pivotally mounted. As seen in Figure 2, sleeve 10 also carries is depending arm BI hav-.

ing a pin 02 thereon on which a pusher link 83 is pivotally mounted. Spring 04 urges pusher link 03 in a clockwise direction to maintain its notched end in operative engagement with push rod 01 which may be slidably mounted for endwise movement in the cross-brackets I1, I0 and 00 (Figures 2 and 7). Thus depression of the right shift key through arm 11, sleeve 18 and arm 0| causes pusher link 33 to move the push rod 01 rearwardly. Depression of the left shift key 1I through the arm rocks the shaft 13 which carries a depending arm similar to the arm 8| on which a spring-urged pusher link similar'to the pusher link 03 is pivoted for engagement with .a push rod 30 (Figure '7) which rod 09 is similar in all respects to push rod 01.

The respective push rods 31 and 39 upon de pression of the respective keys 10 and H serve to enable respective drive connections from the actuating shaft to a shift drive gear in a manner to be described. As seen in Figures 5 and '1. each of the push rods 01 and 09 is telescopically enlaged within acoilar 3|, the respective collars I being secured to respective forked arms 92 and 13. Springs 04 compressed between collars II and washers 05 on respective rods 01 and 39 maintain each telescopic push rod connection in extended position.

Forked arms 02 and 53 engage respective annular grooves in shiftable drive-establishing colhrs 31 and II, which have endwise-slidable driving engagement with collars 33 secured on the rearward ends of adjacent actuating shafts 41.

' ed on brackets I6 by means of suitable spacers and bolt connections I01.

As seen in Figures 1, 5, and 7, gear sleeve I03 carries gear III which meshes with wide idler gear II! suitably journaled on bracket I5 and plate I05. Idler gear II2 also meshes with large gear II3 of a double gear assembly including a small gear II4 meshing with shift drive gear I IS. The gear assembly II3 and H4 are carried by shaft II1 suitably Journaled in brackets I5 and plate I08. Gear H5 is carried by shaft H5 suitably joumaled in brackets I5 and in upward olfset portion I06a (Figure 5) of plate I06.

As seen in Figure 7, gear sleeve I04 carries gear I2I which meshes directly with gear II3 of the double gear assembly. The result is that gear sleeves I03 and I04, when driven, serve to drive the gear train including gears H3, H4, and H3 in opposite directions. The gearing provides a drive ratio of four to one, so that each rotation of the gear sleeve I03 or gear sleeve I04 will provide a one-quarter rotation of gear I I5.

As'seen most clearly in Figures 1 and 5, shaft II 3 which carries shift drive gear H5 also carries a drive plate I 3| carrying four equally spaced shift drive pins I32 for engagement with notches I33 of shift rack I34 on carriage 2I. As seen in Figure 4, yieldable pawl I30 pivoted at I31 on rack I34 provides one wall of one end slot I33, so that the disc I? upon clockwise rotation, as shown in Figure 4, will be ineffective to shift the carriage past its end position but can become effective upon counter-clockwise movement to shift the carriage from its left-most position as viewed from the front of the machine.

The arrangement is such that depression of right shift key 10 operates through the associated linkage to engage drive tooth IOI with its corresponding notch I02 (Figure 7) of gear sleeve I03 to effect right-hand shifting of the carriage (i. e., to the left as shown in Figure 4) by causing counter-clockwise rotation of disc I3I. Correspondingly, depression of left shift key 1| causes shifting of the carriage to the left as viewed from the front of the machine by engaging drive collar 53 Figure '7 with gear sleeve I04 to effect clock- -wise rotation of disc I3I as viewed in Figure 4.

I when the carriage reaches its right end position.

As seen in Figure 3, lever I4I pivoted at I42 has an ear I43 underlying pusher link 83 and is pivotally and slidably connected at I44 with lever I46 pivoted on shaft 36. Lever I48 carries a roller I41 which overlies (Figure 4) an end of a lever I40 pivoted at I40 to the lower end of a lever I5I pivoted-at I52 on a plate I53 carried by bracket I5. Lever I48 has a cam surface I54 normally abutting a pin I50 on plate I53. The upper arm of lever I5l carries a roller I51 which is adapted for engagement by arm I50 mounted on rack I34 when the carriage is shifted into its right end position (its leftmost position as viewed in Figure 4) to rock lever I M in a counter-clockwise direction and thereby move lever I43 to the right as viewed in Figure 4, whereby pin I53 operates on cam surface I84 to rock lever I44 in a clockwise direction and operate the lever I48. The lever I48 is moved in a counter-clockwise direction as viewed in Figure 3 to oscillate lever I" in a clockwise direction and thereby lift pusher link 83 against the tension of its spring 84 and move it out of engagement with push rod 81 which is then retracted by the spring (not shown) that is usually provided between the frame I8 and the push rod 81 to urge the push rod forwardly to disengage the drive connection between collar 81 and gear sleeve I83.

In a similar manner, the left shift clutch may be disengaged upon arrival of the carriage in the left end position by utilizing the action of the pawl I38 (Figure 4), a suitable linkage for which purpose is disclosed in the patent to Friden No. 2,352,376 and described therein at page 5, col. 1, lines 5 to 30.

Means are provided for locking the carriage in any shifted position thereof, said means being releasable upon operation of either shift key. As best seen in Figures 5 and 6, the shift disc I3I carries four pins I88 equally spaced thereabout for cooperation with the upper ends of a pair of scissor levers I61 and I68 pivoted at I18 and I88 respectively on plate I88 and having a pin and slot connection I1I. Stop arms I81 and I88 are urged together into operative relation with respect to pins I88 by spring I12 tensioned between the lower ends thereof. Stop arm I81 carries 9. depending arm I13 which lies in front of an ear I14 (Figures 5 and 'l) of a link I18 pivotally connected to similar bell cranks I11 which are pivoted on vertical axes on respective brackets I18. Each bell crank I11 has an arm I18 lying in front of a depending tab I88 of respective push forks 82 and 83 and together with the link I18 form a parallel linkage which, upon operation of either of push rods 81 and 88, is operated to rock the stop arms I81 and I88 to disengaged position, as shown in Figure 6, for example.

The shift drive disc I3I has centralizing means associated therewith which operate to insure accurate positioning of the carriage in any sh fted position thereof and which are controlled to be disabled during plural cycle operation of the shifting mechanism until the carriage is in the desired shifted position. As seen in Figure 5. the shift disc I3I is provided with four equally spaced centralizing depressions |8I which are in equally spaced-apart relation between the pins I32. Opposite depressions I8I are engaged by respective rollers I82 journaled at the upper ends of respective centralizing bell cranks I83 and I84 pivoted at I86 and I81 respectively on plate I86. The upper arms of centralizing bell cranks I83 and I84 are connected by tension spring I88 which serves to urge rollers I 82 into centralizing engagement with the depressions I8I of the disc I3I.

The lower arms of respective bell cranks I83 and I84 extend into overlapping relation, and are connected so that the centralizing bell cranks move together. As seen in Figure 5, bell crank I83 is provided with reduced portion I88 on its lower arm which overlies the pin I8I carried by bell crank I84. Bell crank I84 on its lower arm carries a downwardly extending ear I82 which, in the centralizing position of hell cranks I83 and I84, is positioned alongside the upper end I83 of a latch lever I84 which is pivoted at I86 on plate I88. Lever I84 is urged in a clockwise direction, as viewed in Figure 5, by spring I81 secured thereto and to plate I88.

From the foregoing description, it will be seen that upon rotation of plate I3I the rollers I82 are lifted from depressions I8I of the cam disc I3I to raise portions I88 thereof, as shown in Figure 6, for example. when the lower arms of the bell cranks have been lifted to allow latch end I83 to snap under ear I82 to maintain the bell cranks I83 and I84 in non-centralizing position where they will not engage the cam disc I3I during rotation thereof.

Automatically operable means are provided for maintaining the latch I84 active during plural cycle operation of the shifting mechanism and for disabling the latch upon completion of the desired shifting operation. For this purpose, the lever I84 is provided with an arm 28I which overlies a roller 283 carried by a cam follower arm 284 pivoted at 288 on plate I83 and urged in a clockwise direction by spring 281. Cam follower arm 284 is provided with a tooth 288 which is adapted in the full-cycle position of the parts to seat in a notch 288 of a cam disc 2 secured on the extended end 2I2 of one of actuating shafts 41.: Disc 2H is adapted to rotate in a clockwisedirection, as viewed in Figure 5, and in the trailing side of its notch 288 is provided with a cam face cooperating with the cam face of tooth 288 to lower the arm 284 and allow latch lever I84 to move into latching engagement with tooth I82.

Thus latch lever I84 moves into latching engagement with the bell cranks I83 and I84 when they are engaged with high portions I88 of disc I3I. It will be noted that the contour of cam disc 2 is slightly spiralled to provide a higher radial depth at point a on one side of the cam notch 288 with respectto point I) at the other side thereof, the action being such that upon 1 continuous rotation of cam disc 2I I during a plural cycle operation, the cam follower arm 284 does not have sufficient time to fall into the notch 288. Thus while a plural cycle shifting operation is in progress, the centralizing bell cranks I83 and I84 are maintained in the displaced position shown in Figure 6, so that their action on the disc I3I is avoided. This results in a smooth, even shifting operation and in a substantial reduction of noise of operation which would occur if the centralizing rollers I82 were allowed to follow the periphery of the disc I3I at all times. Thus the only time that the rollers I82 follow the periphery of the disc I3I is during a single step shifting operation.

Preferably, means is provided to prevent operation of the centralizer latching means during division operation to enable functioning of the centralizing bell cranks irrespective of the continuous cycle operation of the actuating means in performing division. Referring to Figures 1, 4, 5, shaft 2I4 of a conventional form of division mechanism as shown in said Patent No. 2,229,889 is settable in a, clockwise direction through arm 2| 5 and pin 2| 6 of the division setting mechanism. Shaft 2I4 carries an arm 2I1 having its and normally above and out of the path of an extension 2I8 of latch lever I84. Upon setting of shaft 2I4 during division arm 2I1 moves into blocking relation with respect to extension 2I8 of latching lever I84 to block operative movement thereof during division.

Figures 8 to 12 inclusive illustrate a modified form of the invention wherein similar parts are numbered as in Figures 1 to 7 and wherein modifled parts are supplied with the suffix a. In this modification, the control for delatching the centralizing bell cranks is exerted from the means for determining plus or minus registration on the numeral wheels. Referring to Figures 8, 9 and 10, the shift disc Iii is shown with its shift pins I82 for operating the carriage shift rack III in the usual manner through the gearing I I8, H4, etc., from respective actuating shafts 41 under the control of respective shift forks 82 and 88. Pins I88 on the disc Ill cooperate with stop arms I81 and I88 in the same manner, and the movement of the stop arms to and from active position is under control of the parallel linkage I1, I11 and the forks 82 and 82 in the same manner.

The centralizing bell cranks Illa and Illa are modified slightly from the previous construction in that the bell crank I881: is provided with the depending ear l82a while bell crank Illa has the reduced end i89a overlying pin "la.

Ear l82a is adapted to cooperate with latching end 182a of latching lever i8la which is urged in a counter-clockwise direction by spring 218. The lower end of latch lever 188a isprovided with V-shaped notch 2H for cooperation with a pin 222 carried at the end of an arm 223 secured on shaft 38. When the shifting mechanism is not in operation, pin 222 is centered with respect to the notch 22i and is spaced therefrom an amount to permit rocking of latch lever Ina from inactive position (Figure 8) to active position (Figure 12).

It will be recalled that shaft 28 is rocked in one or the other direction from its normal position shown in Figure 1 whenever positive or negative registration on the numeral wheels is determined by setting of the plus-minus gear assembly 28. Therefore, with the parts shown as positioned in Figure 8. the plus-minus gear assembly is in its central neutral position and a shifting operation can occur.

Figure 11 shows the position of the parts when a shift key is first depressed to release the stop arms I81 and III to allow the shifting operation, but before the shifting operation has started. Figure 12 shows the position of the parts during a plural shifting operation when the centralizing bell cranks Illa and l8la are maintained disabled by the latch lever lfla, and pin 222 is seated in notch 22L Upon the conclusion of a shifting operation the centralizing bell cranks Illa and "la are maintained in disabled position by latching lever lsla until the beginning of a registration, when the rocking of shaft will become operative through the arm 222 and pin 222 to rock latch lever I980, from the position shown in Figure 12. The movement of lever Illa serves to release centralizing bell cranks 183a and "la for return into engagement with the shift disc I31 to centralize the carriage in its original position before beginning of the registration and before actual meshing of the plus-minus gears 28 with the corresponding gears of the register.

In operation of the modification disclosed in Figures 8 through 12, the parts are initially positioned as shown in Figure 8. When the operator first depresses a shift key and before beginning of the drive, the depression of the key moves one of the shift forks 82 or 82 and operates through the parallel linkage I18, I11 to rock the stop arms I 81, I88 from the position shown in Figure B to that shown in Figure 11. This operation occurs before the engagement of the drive connection for the selected shift drive. Subsequently, upon engagement of the clutch and closing of the motor circuits the shift disc I31 begins to turn and the rollers I82 of the centralizing bell cranks l83a and IBM: ride out of the depressions I8! 01 the cam disc and onto the high points thereof. This oscillation of the centralizing bell cranks IBM and [84a allows the latch lever l93a to move into latching position as shown in Figure 12 so that during subsequent shifting operation the centralizing bell cranks l83a and Iflla are held in their inactive positions.

The disengagement of the centralizing bell cranks is maintained until the beginning of the next subsequent registering operation when oscillation 0f the shaft 38 in setting the plus-minus gears will operate through arm 223 and pin 222 to move the latching lever l93a to the inactive position shown in Figure 8 when the centralizing bell cranks 183a and IBM are free to move into engagement with opposite depressions l8| of the cam disc BI, and thereby accurately center the register carriage with respect to the actuating means before actual registering operation commences.

We claim:

1. In a calculating machine having a cyclically operable mechanism and means for centralizing said mechanism a latch lever for holding said centralizing means in inactive position, means for controlling the movement of said lever from active position including a notched cam disc and an arm having a nose for seating in the notch of said cam disc in the full cycle position thereof, and means for driving said notched cam disc in cyclic fashion in time with the operation of said mechanism.

2. In a calculating machine having a cyclically operable mechanism, means for centralizing said mechanism, a latch lever for holding said centralizing means in inactive position, a spring urging said latch lever to active position, means for controlling the movement of said lever from active position including a notched cam disc and an arm having a nose for seating in the notch of said cam disc in the full cycle position thereof, a second spring stronger than said first spring urging said arm against said disc, and means for driving said notched cam disc in cyclic fashion in time with the operation of said mechanism.

3. In a calculating machine having a shiftable carriage, numeral wheels in said carriage, and actuating means for said numeral wheels; means for shifting said carriage selectively in either direction from one ordinal position to another in response to manual control of said shifting mechanism, means for centralizing said shift mechanism and said carriage in a. selected ordinal position thereof, means for latching said centralizing means in inactive position during a plural cycle shifting operation, a member movable upon setting the machine for a registering operation, and means controlled by said member upon movement thereof for rendering said latching means ineffective.

4. In a calculating machine having a shiftabie carriage, numeral wheels in said carriage, and actuating means for said numeral wheels; means for shifting said carriage selectively in either direction from one ordinal position to another. means for centralizing said shift mechanism and said carriage in a selected ordinal position thereof, means for latching said centralizing means in inactive position during a plural cycle shifting operation, means settable as an incident to initiation of a calculating operation, and means controlled by said settable means for disabling said latching means.

5. In a calculating machine having a cyclically operable mechanism, means for driving said mechanism, means for centralizing said mech-' anism in a selected position, means for latching said centralizing means in inactive position during a plural cycle operation, and means automatically controlled by said driving means for permitting operation of said latching means during the time said driving means is active, said last named means including a notched cam disc connected to said driving means and a cam follower member having a projection for seating in the notch of said disc in the full cycle position thereof.

6. In a calculating machine having a cyclically operable mechanism, means for driving said mechanism, means for centralizing said mechanism in a, selected position, means for latching said centralizing means in inactive position, during a plural cycle operation, and means automatically controlled by said driving means for permitting operation of said latching means during the time said driving means is active, said last named means including a notched cam disc connected to said driving means and a cam follower member having a projection for seating in the notch of said disc in the full cycle position thereof, the width of the notch of said cam being so proportioned and related to the circumference of said disc and the speed of said driving means to prevent substantial entering of said notch by said projection with the disc rotating.

7. In a calculating machine having a cyclically operable mechanism, means for driving said mechanism, means for centralizing said. mechanism in a selected position, means for latching said centralizing means in inactive position during a plural cycle operation, and means automatically controlled by said driving means for permitting operation of said latching means during the time said driving means is active, said last named means including a notched cam disc connected to said driving means and a cam follower member having a projection for seating in the notch of said disc in the full cycle position thereof, the trailing edge of the notch of said disc and the cooperating face of said projection providing cooperating cam surfaces tending to lift said projection from the notch.

8. In a calculating machine having a shiftable carriage, means for shifting said carriage including a rotatable element, and cyclically operable means for driving said shifting means: a carriage centralizer comprising a cam on said rotatable element and a lever spring-urged toward said cam, means ,for disabling said centralizer comprising a latch adapted to latch said lever in inoperative position upon movement of said lever to said position by said cam on said rotatable element, and means for enabling said centralizer at the conclusion of operation of said shifting means comprising means for tripping said latch and means operated in timed relationship with said cyclically operable driving means for restraining said trippin means until the operation of said shifting. means is concluded.

9. In a calculating machine having a shiftable carriage, means for shifting said carriage including a rotatable element, means for'driving said shifting means from a source of power, a clutch for controlling operation of said driving means, means for disengaging said clutch and invariably stopping the driven member thereof in full-cycle position: a carriage centralizer comprising a cam on said rotatable element and a lever springurged toward said cam, means for disabling said centralizer upon engagement of said clutch comprising a latch adapted to latch said lever in inoperative position upon movement of said lever to said position by said cam on said rotatable element, and means for enabling said centralizer upon disengagement of said clutch comprising means for tripping said latch, a second cam, means for rotating asid second cam in synchronism with said driven member of said clutch, said second cam restraining said tripping means during operation of said clutch and releasing said tripping means upon stopping of said driven member of said clutch in said full-cycle position.

CARL M. FRIDEN. lANI'HONY B. MACHADO. 

